国际中文开源期刊平台

球铁合金形成的复合结构材料分析

Analysis of composite structure material formed by nodular iron alloy

材料科学与工程 / 2019,1(2)：39-47 / 2019-12-11 638 783

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• 作者： 傅六安     
• 单位：

   大连理工大学，大连

• 关键词： 离心铸造；再生复合材料；力学性能；显微组织；基体合金化
• centrifugal casting; recycled composites; mechanical properties; microstructures; matrix alloying
• 摘要： 通过对废旧复合材料的重熔和离心铸造，获得了由外表面厚度达10～15mm的再生复合材料层和芯部Fe-C基体材料组成的复合结构厚壁环试样。力学性能测试表明，厚壁环外表面具有较高的硬度（HRC55.8～63.3），芯部Fe-C基体具有较高的冲击韧性（5.7～6.9J/cm2）和较高的抗压强度（2460～2680MPa），适用于高速热轧领域的工作环境；随着离心机转速（780～920r/min）的提高，试样整体的硬度在增加，基体的抗压强度也在增加，而试样整体的冲击韧性在减小。微观组织分析表明，再生复合材料组织内未溶碳化钨颗粒（WCP排列紧密，分布均匀，其体积分数高达54%～70%；随着离心机转速的提高，再生复合材料组织内未溶WCP的体积分数升高；在重熔再生过程中，WCP的表面被高温Fe-C合金熔体局部溶解使基体被高度合金化，在随后的冷却成形中，试样芯部基体组织内原位析出了碳化钨结晶体，以及含有Fe、W等元素的细粒状和网状的碳化物相。
• The thick-walled ring samples were prepared by means of the remelting and centrifugal casting of waste composites. The surface layer of the sample is of recycled composite with a thickness of 10-15 mm and the core is Fe-C alloy matrix. Mechanicaltest reveals that the hardness values of up to HRC 55.8-63.3 can be achieved in the surface layer, and impact toughness values of up to 5.7-6.9 J/cm2and compressivestrength of up to 2 460-2 680 MPa in the core matrix, which meet the demands for the high speed hot-roll. With the increase of the rotating speed (780-920 r/min) of centrifugal machine, the overall hardness of sample and the compressive strength of core matrix increase, while the overall impact toughness somehow decreases. Microstructure analysis shows that the undissolved WC particles (WC,) are compacted and distributed uniformly in the recycled composites with a volume fraction of 54%-70%, and the volume fraction increases with the increase of the rotating speed. During the remelting process, the surface of the WC, has been partially dissolved by the Fe-C alloy melt, which lead to the alloying of the Fe-C matrix, and then some fine WC crystallites and web composite carbides containing Fe and W have been precipitated in the core Fe-C matrix during the solidification.
• DOI： https://doi.org/10.35534/mse.0102006c
• 引用： 傅六安．球铁合金形成的复合结构材料分析［J］．材料科学与工程，2019，1（2）：39-47．